# XSB > dialect of the Prolog programming language and its implementation **Wikidata**: [Q8042469](https://www.wikidata.org/wiki/Q8042469) **Wikipedia**: [English](https://en.wikipedia.org/wiki/XSB) **Source**: https://4ort.xyz/entity/xsb ## Summary XSB is a dialect of the Prolog programming language and serves as its specific implementation. It operates within the logic programming paradigm and is designed to function across various operating systems. The system uses the file extension ".P" and is recognized as a distinct tool for instructing machines using logic-based syntax. ## Key Facts - **Classification:** XSB is a programming language and a dialect of Prolog. - **Paradigm:** It utilizes the logic programming paradigm. - **Compatibility:** The implementation is cross-platform. - **File Extension:** Source files use the extension ".P". - **Website:** The official project site is hosted at http://xsb.sourceforge.net/. - **Key Figure:** The entity is closely related to computer scientist and university teacher David Scott Warren. - **Community:** It has a dedicated tag on Stack Overflow (https://stackoverflow.com/tags/xsb). - **Global Reach:** Wikipedia entries for XSB exist in English, Italian, Ukrainian, and Cantonese (zh_yue). ## FAQs ### Q: What type of programming language is XSB? A: XSB is a dialect of the Prolog programming language. It follows the logic programming paradigm, which is designed for communicating instructions to a machine through logical relations. ### Q: What file extension is used for XSB programs? A: XSB source files utilize the file extension ".P". ### Q: Is XSB limited to a specific operating system? A: No, XSB is a cross-platform implementation, meaning it is designed to operate on multiple different operating systems. ### Q: Who is a key person associated with XSB? A: XSB is related to the computer scientist and university teacher David Scott Warren, who earned his Ph.D. from the University of Michigan in 1979. ## Why It Matters XSB matters in the field of computer science as a specialized evolution of the Prolog language, one of the most prominent logic programming languages in history. By serving as both a dialect and an implementation, XSB provides developers with a specific environment for executing logic-based instructions, bridging the gap between theoretical logic and practical machine application. Its cross-platform nature is significant because it ensures that the logic programming paradigm is accessible to users regardless of their underlying operating system infrastructure, removing a common barrier to entry for specialized languages. The project's enduring presence is evidenced by its active community resources, such as a dedicated Stack Overflow tag and documentation across multiple languages (English, Italian, Ukrainian, and Cantonese). Furthermore, the connection to David Scott Warren, a Ph.D. graduate from the University of Michigan and an academic, suggests that XSB is deeply rooted in rigorous computer science research and education. This positions XSB as not just a software tool, but a subject of study and a vehicle for advancing computational logic. It serves as a critical instrument for those requiring the specific syntactic and functional capabilities of a Prolog dialect that has been maintained and structured for modern cross-platform use. ## Notable For - **Dialect Status:** Distinctly identified as a specific dialect of Prolog rather than a general-purpose language. - **Cross-Platform Design:** Built to function across various operating environments, enhancing accessibility. - **Academic Roots:** Closely associated with computer scientist David Scott Warren, linking it to advanced computer science research. - **Logic Paradigm:** Dedicated specifically to the logic programming paradigm. - **Unique Extension:** Uses the ".P" file extension for its implementation files. ## Body ### Definition and Classification XSB is classified as a programming language and is technically described as a dialect of the Prolog programming language and its corresponding implementation. It falls under the broader category of languages used for communicating instructions to a machine. The primary paradigm associated with XSB is logic programming, a model based on formal logic. ### Technical Specifications The implementation of XSB is characterized by its cross-platform capability, allowing it to run on various operating systems. Programs written in XSB are saved with the file extension ".P". The official online presence for the project is located at http://xsb.sourceforge.net/. The system's metadata and description are maintained across multiple knowledge bases, including a Freebase ID of /m/0ck33d. ### Historical and Academic Context The development and study of XSB are closely linked to the academic community. It is related to David Scott Warren, a prominent computer scientist and university teacher who received his Ph.D. from the University of Michigan in 1979. The language has a notable presence on collaborative platforms, evidenced by a sitelink count of 4 on Wikipedia and a dedicated tag on Stack Overflow for community support and technical discussion. ### Global Presence The documentation and awareness of XSB extend beyond English-speaking regions. Wikipedia articles for the entity exist in four languages: English (en), Italian (it), Ukrainian (uk), and Cantonese (zh_yue).